/Engine/Plugins/Experimental/VirtualProduction/VPRoles/Source/VPRoles/Public/VPRolesSubsystem.h
Delegate called when the roles are modified, ie. role is added, current roles are replaced, etc.
[FOnRolesChangedNative](API\Plugins\VPRoles\UVirtualProductionRolesSubsystem\FOnRolesChangedNative) & OnRolesChanged()